/* レスポンシブ横並び・縦並び */
.header-container {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
}
.header-leftparts {
  margin: 1% 3% 0 3%;
}
.header-rightparts {
  margin: 1% 3% 0 3%;
}

.main-container {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 95%;
}
.leftparts02 {
  margin: 1%;
  width: 100%;
  max-width: 300px;
}
.rightparts02 {
  margin: 1%;
  width: 100%;
  max-width: 350px;
}

@media (max-width: 768px) {
  .header-container, .main-container {
    flex-direction: column; /* 縦方向に並べる */
  }
}